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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4894a343221cdf29fd8178a9c27088fb2ec9029db933b8909199e8558b2b02a' 
  AND token = '9w2doBnOYIfK/y4/5KDk+xJTXBGI79bn+i7D1DHisyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}